Q: What is 4 times the number of cows plus 2 times the number of ducks?

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3 times 3 = 9 plus the number 3 = 12.

How about: 1 times 91 plus 4 = 95 or 7 times 13 plus 4 = 95

6n + 7n (= 13n)

If the question was: "What is the answer to 8 cows plus 4 cows ?", you'd have no trouble with it. Why are 'x's so much more mysterious and harder to handle than cows are ??

2 times a number minus 17 plus 20 times a number minus 9 is the same as 2x - 17 + 20x - 9 = 22x - 26

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18 is a solution to the equation 4 plus 7 times a number where the result is 9 times that number.

3 times 3 = 9 plus the number 3 = 12.

How about: 1 times 91 plus 4 = 95 or 7 times 13 plus 4 = 95

the number is 3 because 3 times 5 is 15 plus 2 is 17

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6n + 7n = 13n

3x+5x

6n + 7n (= 13n)

2 times a number minus 17 plus 20 times a number minus 9 is the same as 2x - 17 + 20x - 9 = 22x - 26

If the question was: "What is the answer to 8 cows plus 4 cows ?", you'd have no trouble with it. Why are 'x's so much more mysterious and harder to handle than cows are ??

Because they are both multiples of two, so when they're added, the sum must be another multiple of two. (One group of twos plus another group of twos must be a new group of twos, just like one group of cows plus another group of cows must be a new group of cows.)

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